#5 Code Review: Ensure all magic uses new magic APIs (consistency)

[Patrick]

Meta6 (codebase) adds an updated magic API (see common/magic/magic.c) to implement spells. Spells should use these new functions rather than re-implement them for each spell. The APIs of note are: CheckMana(), CheckResist(), ResistMsg(), CheckHelpfulSpellTarget(), CheckHarmfulSpellTarget().

This ticket covers a code review of:

• Mage
• Cleric
• Druid
• Lich
• Ninja
• Fire Elemental